We report the experimental observation of room-temperature perpendicular magnetic anisotropy in Ni/Pt multilayers having 7–26 Å Ni and 2.3–4.6 Å Pt layer thicknesses, prepared by dc magnetron sputtering on glass substrates at 7 mTorr Ar sputtering pressure. Perpendicular magnetic anisotropy was found to be sensitively dependent on both Ni- and Pt-layer thicknesses, and a maximum anisotropy energy of 1.74×105 erg/cm3 was obtained for (16 Å Ni/2.3 Å Pt)30 multilayer. Interestingly, magnetization measurements revealed that about two atomic layers of Ni at the interface were magnetically dead in our samples.
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Shin et al. (1998) studied this question.
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